/*
 *  Copyright 2004 Blandware (http://www.blandware.com)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.blandware.atleap.webapp.action.core.role;

import com.blandware.atleap.common.Constants;
import com.blandware.atleap.model.core.Role;
import com.blandware.atleap.service.core.RoleManager;
import com.blandware.atleap.service.exception.BeanAlreadyExistsException;
import com.blandware.atleap.webapp.action.core.BaseAction;
import com.blandware.atleap.webapp.form.core.RoleForm;
import com.blandware.atleap.webapp.util.core.WebappConstants;
import com.blandware.atleap.webapp.util.core.WebappUtil;
import org.apache.commons.validator.GenericValidator;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.springframework.orm.ObjectOptimisticLockingFailureException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * <p>Updates role
 * </p>
 * <p><a href="UpdateRoleAction.java.html"><i>View Source</i></a></p>
 * <p/>
 *
 * @author Sergey Zubtsovskiy <a href="mailto:sergey.zubtsovskiy@blandware.com">&lt;sergey.zubtsovskiy@blandware.com&gt;</a>
 * @version $Revision: 1.20 $ $Date: 2008/04/29 17:48:09 $
 * @struts.action path="/core/role/update"
 * name="roleForm"
 * scope="request"
 * input="inputForward"
 * validate="true"
 * roles="core-role-update"
 * @struts.action-forward name="inputForward"
 * path=".core.role.update"
 * @struts.action-forward name="viewRole"
 * path="/core/role/view.do"
 * redirect="true"
 * @struts.action-forward name="listRoles"
 * path="/core/role/list.do"
 * redirect="true"
 * @struts.action-forward name="callUpdateRole"
 * path="/core/role/callUpdate.do"
 * redirect="false"
 * @struts.action-forward name="unsatisfiable"
 * path="/core/role/list.do"
 */
public final class UpdateRoleAction extends BaseAction {
	/**
	 * @param mapping  The ActionMapping used to select this instance
	 * @param form     The optional ActionForm bean for this request (if any)
	 * @param request  The HTTP request we are proceeding
	 * @param response The HTTP response we are creating
	 * @return an ActionForward instance describing where and how
	 *         control should be forwarded, or null if response
	 *         has already been completed
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
	                             HttpServletRequest request, HttpServletResponse response) throws Exception {

		if ( !isCancelled(request) ) {

			RoleForm roleForm = (RoleForm) form;

			String roleName = roleForm.getName();
			if ( GenericValidator.isBlankOrNull(roleName) ) {
				if ( log.isWarnEnabled() ) {
					log.warn("Missing role name. Returning to list...");
				}
				return mapping.findForward("listRoles");
			}

			request.getSession().setAttribute(WebappConstants.ROLE_NAME_KEY, roleName);

			RoleManager roleManager = (RoleManager) getBean(Constants.ROLE_MANAGER_BEAN);

			Role role = roleManager.retrieveRole(roleName);

			if ( role == null ) {
				// role not found. it might be deleted by someone else
				ActionMessages errors = new ActionMessages();
				errors.add("roleNotFound", new ActionMessage("core.role.errors.notFound"));
				saveErrors(request, errors);
				return mapping.findForward("listRoles");
			}

			WebappUtil.copyProperties(role, roleForm, request);

			try {
				roleManager.updateRole(role);
			} catch ( BeanAlreadyExistsException e ) {
				// role already exists
				ActionMessages errors = new ActionMessages();
				errors.add("roleAlreadyExists", new ActionMessage("core.role.errors.alreadyExists"));
				saveErrors(request, errors);
				saveToken(request);
				return mapping.getInputForward();
			} catch ( ObjectOptimisticLockingFailureException e ) {
				// role was updated or deleted by another transaction
				ActionMessages errors = new ActionMessages();
				errors.add("updateFailed", new ActionMessage("core.role.errors.updateFailed"));
				saveErrors(request, errors);
				return mapping.findForward("callUpdateRole");
			}
		}
		return mapping.findForward("listRoles");
	}
}